arm: mvebu: turris_omnia: Do not fail in fixup_mtd_partitions when partitions do not exist

All partitions are created by fixup_mtd_partitions() function, so they do
not have to exist just for their removal need.

Fixes: 92f36c8e74c1 ("arm: mvebu: turris_omnia: fixup MTD partitions in Linux' DTB")
Signed-off-by: Pali Rohár <pali@kernel.org>
Reviewed-by: Stefan Roese <sr@denx.de>
Reviewed-by: Marek Behún <kabel@kernel.org>
diff --git a/board/CZ.NIC/turris_omnia/turris_omnia.c b/board/CZ.NIC/turris_omnia/turris_omnia.c
index a7c1c1f..796c55f 100644
--- a/board/CZ.NIC/turris_omnia/turris_omnia.c
+++ b/board/CZ.NIC/turris_omnia/turris_omnia.c
@@ -974,11 +974,10 @@
 	int parts;
 
 	parts = fdt_subnode_offset(blob, offset, "partitions");
-	if (parts < 0)
-		return false;
-
-	if (fdt_del_node(blob, parts) < 0)
-		return false;
+	if (parts >= 0) {
+		if (fdt_del_node(blob, parts) < 0)
+			return false;
+	}
 
 	parts = fdt_add_subnode(blob, offset, "partitions");
 	if (parts < 0)